In the areas of intensive cultivation with excessive use of irrigation, especially in areas of green revolution, the fertile alluvial soils are becoming saline. What should be added in the soil to solve the problem of salinity?

In the areas of intensive cultivation with excessive use of irrigation

1.	In the areas of intensive cultivation with excessive use of irrigation, especially in areas of green revolution, the fertile alluvial soils are becoming saline. What should be added in the soil to solve the problem of salinity?
A.	Calcium
B.	Nitrogen
C.	Phosphorus
D.	Gypsum
Answer» E.